NAC445A.6556. “Approved check valve” defined.

Latest version.

“Approved check valve” means a check valve:

     1. Which does not drip in the normal direction of flow when the inlet pressure is 1 psi or more and there is no outlet pressure.

     2. Which allows no leakage in the direction opposite the normal direction of flow.

     3. In which the closure element is internally loaded in such a manner as to promote rapid and positive closure.

(Added to NAC by Bd. of Health, eff. 2-20-97)

                    
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